195915402887 has 4 divisors (see below), whose sum is σ = 196756241760. Its totient is φ = 195074564016.

The previous prime is 195915402883. The next prime is 195915402913. The reversal of 195915402887 is 788204519591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788204519591 = 14033 ⋅56167927.

It is a cyclic number.

It is not a de Polignac number, because 195915402887 - 2² = 195915402883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195915402883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420419087 + ... + 420419552.

It is an arithmetic number, because the mean of its divisors is an integer number (49189060440).

Almost surely, 2^195915402887 is an apocalyptic number.

195915402887 is a deficient number, since it is larger than the sum of its proper divisors (840838873).

195915402887 is an equidigital number, since it uses as much as digits as its factorization.

195915402887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840838872.

The product of its (nonzero) digits is 7257600, while the sum is 59.

The spelling of 195915402887 in words is "one hundred ninety-five billion, nine hundred fifteen million, four hundred two thousand, eight hundred eighty-seven".